Quick answer
Electricity is the movement of electrons from atom to atom, and the energy that movement carries through a wire to light, heat and run the things you plug in.
It is a secondary energy source: power plants make it from coal, gas, nuclear, wind, sun or water. A grid of high- and low-voltage lines then carries it to your meter, your panel and your outlets.
Quick facts
The key facts about Electricity, with sources:
- What moves
- Electrons, the negatively charged particles around an atom 1
- Unit of flow
- Ampere (amp), an SI base unit 6
- Unit of push
- Volt; 1 volt = 1 watt per amp 6
- Unit you pay for
- Kilowatt-hour (kWh): 1,000 watts for one hour 2
- Average US home use
- About 10,791 kWh a year in 2022, roughly 899 kWh a month 4
- US grid type
- Alternating current at 60 cycles a second 7
Key takeaways
- Electricity is electrons moving through a conductor, such as the copper wire in your walls.
- Three numbers describe it: volts (the push), amps (the flow) and watts (the work done). Your bill counts kilowatt-hours.
- The US grid sends alternating current at 60 cycles a second. Batteries, solar panels and LEDs work on direct current.
- A home circuit carries enough current to kill. OSHA lists heart failure at 1 to 4.3 amps, far below what a 15-amp breaker lets through.
- You can read your panel, reset a tripped breaker once and spot warning signs. Wiring work belongs to a licensed electrician.
Electricity in plain words
Every atom has a center, called the nucleus, and tiny particles called electrons that circle it. The U.S. Energy Information Administration (EIA) explains that some outer electrons are only loosely held. They can jump to the next atom. That movement of electrons from atom to atom is electricity 1.
Metals such as copper and aluminum let electrons move with little resistance, so they make good wires. OSHA calls these materials conductors.
Glass, plastic, porcelain and dry wood slow or stop the flow, so they are called insulators 8.
A house wire is a conductor wrapped in an insulator, which keeps the current on its path.
Electricity is not a fuel you dig up. The EIA lists it as a secondary energy source, made by power plants from other sources 1. That is why your bill can change when gas prices change, even if you have no gas line.
The four numbers that describe electricity
| Quantity | Unit | Plain meaning | Where you see it |
|---|---|---|---|
| Voltage | Volt (V) | The push that moves electrons | 120 V outlets, 240 V dryer and range circuits |
| Current | Ampere (A) | How much charge flows each second 6 | Breaker handles: 15, 20, 30, 50 |
| Power | Watt (W) | How fast energy is used; volts × amps | Bulb and appliance labels |
| Energy | Kilowatt-hour (kWh) | 1,000 watts used for one hour 2 | Your monthly electric bill |
How electricity does work in a home
Current only flows when there is a closed loop. OSHA puts it simply: electricity travels in closed circuits, normally through a conductor 8.
In a home, current leaves the panel on a hot wire, passes through a lamp or motor, and returns on the neutral wire.
Flip a switch off and the loop opens, so the flow stops.
The thing in the middle of the loop turns electrical energy into something useful. A toaster turns it into heat. A bulb turns it into light. A motor turns it into motion. The faster it converts energy, the more watts it uses.
Three units tie together. NIST, the U.S. standards agency, defines the volt as one watt per ampere 6. So watts equal volts times amps. A 1,500-watt heater on a 120-volt outlet draws about 12.5 amps. That one rule explains most breaker trips.
Watts = Volts × Amps
Volts- The push; 120 V or 240 V in a US home
Amps- The flow of charge each second
Watts- The rate of work; 1 V equals 1 W per A by NIST definition
Source: [6]
The path from power plant to outlet
- Power plant makes electricity → transformer raises the voltage for long lines
- High-voltage transmission lines → substation transformer lowers the voltage
- Low-voltage distribution lines → pole or pad transformer near your street
- Service drop → meter → electrical panel → branch circuits → outlets and lights
Sources: [3]
Why the grid uses high voltage, then low voltage
The EIA says higher voltage makes long-distance transmission more efficient and less expensive 3. So power plants step the voltage way up. Near homes, transformers step it back down, because lower voltage is safer to use in homes and businesses 3.
Step-up and step-down only works because the US grid uses alternating current. The Department of Energy notes that AC can be changed to a higher or lower voltage with a transformer, while direct current is not easily converted 7. That fact settled the 1890s fight between Edison and Westinghouse.
Types of electricity you will hear about
| Type | What it is | Home example |
|---|---|---|
| Alternating current (AC) | Current that reverses direction, 60 times a second in the US 7 | Wall outlets, lights, the panel |
| Direct current (DC) | Current that flows one way only 7 | Batteries, phone chargers, solar panels, EVs |
| Static electricity | Charge that builds up on a surface and then jumps | A shock from a doorknob in dry winter air |
| Single-phase power | One AC wave, split into 120 V and 240 V at the home | Almost every US house |
| Three-phase power | Three AC waves offset in time; DC fast chargers often take it as input 12 | Shops, offices, large chargers |
Example: what one month of electricity costs
The worked example uses two published averages. The EIA says the average US home bought about 899 kWh a month in 2022 4. The EIA also reports an average US residential price of 18.31 cents per kWh in July 2026 (preliminary) 5.
| Step | Math | Result |
|---|---|---|
| Monthly use | EIA 2022 average | 899 kWh |
| Price | EIA US average, July 2026 | 18.31¢ per kWh |
| Energy charge | 899 × $0.1831 | About $164.60 |
| Same use in Louisiana (12.72¢) | 899 × $0.1272 | About $114.35 |
| Same use in California (33.61¢) | 899 × $0.3361 | About $302.15 |
This is energy arithmetic, not a quote. Real bills add fixed fees, taxes and tiered rates. Use the outage cost tool or your own bill to work with real numbers.
Where electricity shows up in your paperwork
Your bill lists energy in kilowatt-hours, often with a 12-month graph. The EIA explains that utilities measure electricity in kWh 2. The meter outside your home counts those kWh.
Your panel label lists the main breaker size in amps, such as 100 or 200. That is the most current your home can draw at once. Our guide to finding your service size shows where to look.
Appliance nameplates list volts and watts, or volts and amps. An electrician quote may list circuit sizes, wire gauges and the code edition. Each is a measure of the same thing: how much electricity a part can carry safely.
What electricity does well, and where it falls short
Strengths of electric power at home
Limits and trade-offs
- It cannot be seen, heard or smelled until something goes wrong.
- The grid needs a steady balance of supply and demand. Outages leave a home with no power unless it has backup.
- Each home has a fixed capacity. Adding big loads can mean a panel upgrade.
- Price per kWh varies widely by state 5.
What a home electrical system cannot do
Every wire, breaker and panel has a rating. A circuit cannot safely carry more than its breaker allows. The service cannot deliver more than its main breaker. When people ask why they cannot just plug in one more heater, the answer is that limit.
Electricity also cannot be stored in the wires. It is used the instant it is made, unless a battery holds it. That is why a power cut stops everything at once, and why backup needs a generator or a battery system.
What drives the cost of electricity and electrical work
We do not quote prices for electrical work. These are the factors that move them. See electrical cost guides for sourced ranges.
- Your rate. The price per kWh set by your utility and state. It ranged from 12.72 to 48.00 cents in the states above in July 2026 5.
- How much you use. Heating, cooling, water heating and EV charging are the big loads.
- Service capacity. Adding large loads to a full panel can mean new circuits or a bigger service.
- Age of the wiring. Older homes may need repairs before new work can pass inspection.
- Permits and inspection. Most new circuits need a permit, which adds a fee and time.
- Lifespan. Wiring is built to last decades, but heat, damage and loose connections shorten it. Ask your electrician what condition yours is in.
How new electrical work gets done
Electricians do this work, not homeowners. The steps below help you know what to expect.
- Write down what you want to add, such as a heat pump, EV charger or new room.
- Have a licensed electrician check your panel size and free breaker spaces.
- The electrician runs a load calculation to see if the service can carry the new load.
- The electrician pulls a permit from your city or county.
- The work is done: new circuits, breakers, outlets or panel parts.
- An inspector checks the work against the adopted code, then signs it off.
Simple habits that keep a home system healthy
- Know which outlets each breaker controls. The CPSC tells consumers to know their circuits 9.
- Keep the panel door closed and the area in front of it clear.
- Press the TEST button on each GFCI outlet once a month, then RESET.
- Plug heaters and other high-wattage items straight into the wall, not into a power strip.
- Use extension cords only for short-term needs. The CPSC says they are not meant as permanent wiring 10.
- Book an electrical inspection when you buy an older home or before big upgrades.
Risks, warning signs and when to call
Small currents can do great harm. OSHA lists about 1 milliamp as a faint tingle, 50 to 150 milliamps as possibly fatal, and 1,000 to 4,300 milliamps as the range where the heart stops pumping 8. A home circuit can carry thousands of milliamps.
Fire is the other risk. The CPSC estimates an annual average of 17,100 home fires from electrical distribution equipment in 2019 to 2021, with about 150 deaths a year 11.
Call an electrician for frequent trips, warm outlets, flickering lights, buzzing or a burning smell. Call 911 for smoke or fire. Our electrical safety hub lists more signs.
Never touch a live part
Wet skin conducts far better than dry skin 8. Do not open a panel, outlet or fixture. If someone is being shocked, do not touch them; cut power at the breaker if you can and call 911.
Who sets the rules for electricity in homes
The National Electrical Code, NFPA 70, is the model rulebook for wiring in US buildings. NFPA offers free read-only access to the 2026 edition 13. The code is revised on a three-year cycle, and the 2026 edition was finalized in 2025 14.
A model code has no force until a state or city adopts it. Minnesota, for example, set up a committee that reviewed the 2026 NEC on 25 September 2025 before adoption 14. Your inspector enforces whatever edition your jurisdiction adopted, with any local changes.
OSHA rules cover electrical safety at work, not in your home 8. Utilities control the meter and everything on their side of it.
Electricity compared with the terms around it
| Term | What it describes | Question it answers |
|---|---|---|
| Electricity | The flow of electrons and the energy it carries | What is it? |
| Electrical circuit | The closed loop the current travels | Where does it go? |
| Resistance | How much a material fights the flow | Why do wires get warm? |
| Frequency | How often AC reverses each second | Why 60 Hz? |
| Circuit breaker | A switch that opens on too much current | What stops it? |
Common myths about electricity
- Myth Voltage is what kills, not current.
- Reality Current through the body does the harm, and OSHA ranks shock effects by milliamps 8. Voltage matters because it drives that current.
- Myth A tripped breaker is just a nuisance.
- Reality The CPSC says a trip is often a warning that the circuit is overloaded. Find the cause before resetting 9.
- Myth Electricity is stored in the wires.
- Reality The grid has to make power at the moment you use it. Only batteries store it.
- Myth Rubber shoes make you safe.
- Reality Shoes do not stop a shock through your hands or from a wet floor. Keep away from live parts.
- Myth All homes get the same power.
- Reality Service size differs; many have 100 or 200 amps, and older homes can have less.
What changes by state
Two things change by where you live. The price per kWh ranged from 12.72 cents in Louisiana to 48.00 cents in Hawaii in July 2026 5.
Average use ranged from 6,178 kWh a year in Hawaii to 14,774 kWh in Louisiana in 2022 4. Which NEC edition applies, and who may do electrical work, also vary by state and city.
When this matters to you, and what to do next
Knowing the basic units helps you read a bill, an appliance label and an electrician quote. It also helps you spot an overloaded circuit before it causes a problem.
If you plan a big new load, start with the load calculator. Then get a licensed electrician to confirm the numbers.
Start with the nameplate
Every appliance lists its volts and watts or amps. Write them down before you call an electrician. It speeds up the quote and avoids guesses.
Tools and guides for your next step
- Appliance circuit lookupWhat circuit common appliances need
- Home electrical safety checkWarning signs, room by room
- How to hire an electricianLicenses, quotes and permits
Questions about Electricity
What is electricity in simple terms?
Electricity is the movement of electrons from one atom to the next, and the energy that movement carries. The EIA describes it as electrons shifting between atoms.
In a home, those electrons flow through copper wires in a loop from the panel, through a light or appliance, and back. That flow is what makes a bulb glow or a motor spin.
Where does household electricity come from?
It comes from power plants that burn fuel or use wind, sun, water or nuclear energy. Electricity is a secondary energy source, made from those primary sources. Transformers raise the voltage for long transmission lines, then lower it near your street. The power reaches your meter, then your panel, then each circuit in the house.
Is household electricity AC or DC?
Household wiring in the US carries alternating current, which reverses direction 60 times a second. The DOE notes that AC won out because transformers can change its voltage easily. Many devices still use direct current inside. Phone chargers, LED drivers and laptop bricks turn the AC from the wall into DC for the electronics.
How much electricity does an average home use?
The average US home bought about 10,791 kWh in 2022, the EIA reports. That is roughly 899 kWh a month. Use varies a lot by state. Louisiana homes averaged 14,774 kWh a year and Hawaii homes 6,178 kWh. Climate, home size and whether you heat with electricity drive most of the difference.
What is the difference between volts, amps and watts?
Volts are the push, amps are the flow and watts are the rate of work. NIST defines one volt as one watt per amp, so watts equal volts times amps. A 120-volt outlet feeding a 10-amp load delivers 1,200 watts. Your bill counts kilowatt-hours, which is watts used over time.
How much current can kill a person?
Far less than a home circuit carries. OSHA lists 50 to 150 milliamps as possibly fatal and 1,000 to 4,300 milliamps as the range where the heart stops pumping. A 15-amp circuit can carry 15,000 milliamps. That is why you should never touch live parts and why GFCIs trip at about 5 milliamps.
Why does my breaker keep tripping?
A breaker trips when too much current flows, most often from an overload. The CPSC says a trip is often a warning that the circuit is overloaded, and you should find the cause rather than simply reset it. Unplug some loads and reset once. If it trips again, call a licensed electrician.
Can I do my own electrical work?
Some states let homeowners do limited work on their own home with a permit, but rules vary and the risk is real. We do not give wiring instructions.
Your safe actions are reading the panel, resetting a breaker once, testing GFCIs and unplugging loads. Anything inside a panel, box or fixture is a job for a licensed electrician.
What code governs home electrical wiring?
The National Electrical Code, NFPA 70, is the model code for US wiring. It is revised every three years, and the 2026 edition is the newest. A state or city must adopt an edition before it has legal force. Your inspector enforces the adopted edition plus any local amendments, so check which one applies.
Sources
- U.S. Energy Information Administration, Electricity explained: The science of electricity, retrieved .
- U.S. Energy Information Administration, Electricity explained: Measuring electricity, retrieved .
- U.S. Energy Information Administration, Electricity explained: Delivery to consumers, retrieved .
- U.S. Energy Information Administration, FAQ: How much electricity does an American home use?, retrieved .
- U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A (July 2026 preliminary), retrieved .
- NIST, SI Units: Electric Current, retrieved .
- U.S. Department of Energy, The War of the Currents: AC vs. DC Power, retrieved .
- OSHA 3075, Controlling Electrical Hazards, retrieved .
- U.S. CPSC, Commission Closes Investigation of FPE Circuit Breakers and Provides Safety Information for Consumers (rev. 2011), retrieved .
- U.S. CPSC, CPSC and NESF Urge Consumers to Plug Into Electrical Safety (2000), retrieved .
- U.S. CPSC, 2019–2021 Residential Fire Loss Estimates (May 2024), retrieved .
- U.S. DOE Alternative Fuels Data Center, Developing Infrastructure to Charge Electric Vehicles, retrieved .
- NFPA 70, National Electrical Code, 2026 edition (free access), retrieved .
- Minnesota Dept. of Labor and Industry, NEC 2026 Adoption Review Committee minutes, 25 Sept 2025, retrieved .
Expert review
Written by the HyreElectrical Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Definitions checked against EIA and NIST; shock and fire figures quoted from OSHA 3075 and CPSC; prices from EIA Table 5.6.A as published for July 2026. Bill math is illustrative arithmetic.
Suggest a correction. We fix errors and say what changed.